Bonser S P, Geber M A
Department of Ecology and Evolutionary Biology, Corson Hall, Cornell University, Ithaca, NY, USA.
J Evol Biol. 2005 Jul;18(4):1009-18. doi: 10.1111/j.1420-9101.2005.00904.x.
Optimal plant growth form should vary across environments. We examined the potential for mutations causing large changes in growth form to produce new optimal phenotypes across light environments. We predicted that the upright growth form would be favoured in a light limiting environment as leaves were in a position to maximize light interception, while a rosette (leaves in a basal position) growth form would be favoured in a high light environment. Growth form genotypes of Brassica rapa (upright wild-type and rosette mutants) and Arabidopsis thaliana (large rosette wild-type and increasingly upright growth form mutants) were grown in a greenhouse in control (ambient) and filtered (low) light treatments. Compared to upright genotypes, rosette genotypes had relatively high fitness in control light but had a relatively large fitness reduction in filtered light. Our results demonstrate the potential importance of rapid growth form evolution in plant adaptation to new or changing environments.
最佳植物生长形态应随环境而异。我们研究了导致生长形态发生重大变化的突变在不同光照环境下产生新的最佳表型的可能性。我们预测，在光照受限的环境中，直立生长形态将占优势，因为叶片能够最大限度地拦截光线，而莲座状（叶片处于基部位置）生长形态在高光环境中更受青睐。将芜菁（直立野生型和莲座状突变体）和拟南芥（大莲座状野生型和生长形态越来越直立的突变体）的生长形态基因型种植在温室中，进行对照（环境光）和过滤（低光）光照处理。与直立基因型相比，莲座状基因型在对照光下具有相对较高的适合度，但在过滤光下适合度降低幅度相对较大。我们的结果证明了快速生长形态进化在植物适应新环境或变化环境中的潜在重要性。
